Which of these statements is not true ?

Question

(a) $\;NO^{+}\;$ is not isoelectronic with $\;O_{2}\;$ (b) B is always covalent in its compounds (c) In aqueous solution , the $\;Ti^{+}\;$ ion is much more stable than TI (III) (d) $\;LiAlH_{4}\;$ is a versatile reducing agent in organic synthesis